MICROSTRUCTURE AND MECHANICAL PROPERTIES OF HAYNES® 282® FABRICATED BY ELECTRON BEAM MELTING

Sebastien Dryepondt, Mike M. Kirka, Patxi Fernandez-Zelaia, Kinga A. Unocic

Research output: Chapter in Book/Report/Conference proceedingConference contributionpeer-review

Abstract

The Haynes® 282® Ni-based superalloy (57Ni-20Cr-10Co-8.5Mo-2.1Ti-1.5Al) is a very promising candidate for the fabrication by additive manufacturing of gas turbine components of complex geometries. Alloy 282 was fabricated by electron beam melting (EBM) and exposed to two different heat treatments, (a) solution anneal (SA) at 1135ºC followed by the standard 2-step aging treatment (2h at 1010ºC plus 8h at 788ºC) and (b) SA followed by 4h 800ºC. Large elongated grains were observed for the as-fabricated and annealed EBM 282 materials, with a γ´ (Ni3(Al,Ti)) average size of ~100 nm and 20 nm, respectively. The as fabricated EBM 282 alloy exhibited good ductility at 20-900ºC and tensile strength slightly lower than the tensile strength of wrought 282. Annealing the alloy resulted in a moderate increase of the alloy strength at 800 and 900ºC but a decrease of the alloy ductility. The creep lifetime at 800ºC, 200MPa of the as fabricated and annealed EBM 282 specimens machined along the build direction was 2 times and 1.5 times superior to the expected lifetime for wrought 282, respectively. For creep specimens machined perpendicular to the build direction, the lifetimes were ~25% lower compared to the wrought alloy. These creep results are directly related to the strong grain texture of the EBM 282 alloy and the limited impact of the initial γ´ (Ni3(Al,Ti)) size on alloy 282 creep properties.

Original languageEnglish
Title of host publicationJoint EPRI-123HiMAT International Conference on Advances in High-Temperature Materials - Proceedings from EPRI's 9th International Conference on Advances in Materials Technology for Fossil Power Plants and the 2nd International 123HiMAT Conference on High-Temperature Materials
EditorsJohn Shingledecker, Masao Takeyama
PublisherASM International
Pages558-569
Number of pages12
ISBN (Electronic)9781627082716
DOIs
StatePublished - 2019
EventJoint 9th International Conference on Advances in Materials Technology for Fossil Power Plants, EPRI 2019 and the 2nd International 123HiMAT Conference on High-Temperature Materials - Nagasaki, Japan
Duration: Oct 21 2019Oct 24 2019

Publication series

NameJoint EPRI-123HiMAT International Conference on Advances in High-Temperature Materials - Proceedings from EPRI's 9th International Conference on Advances in Materials Technology for Fossil Power Plants and the 2nd International 123HiMAT Conference on High-Temperature Materials

Conference

ConferenceJoint 9th International Conference on Advances in Materials Technology for Fossil Power Plants, EPRI 2019 and the 2nd International 123HiMAT Conference on High-Temperature Materials
Country/TerritoryJapan
CityNagasaki
Period10/21/1910/24/19

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